Avert a crash in the Android last resort font driver

* java/org/gnu/emacs/EmacsFontDriver.java (FONT_INVALID_CODE):
New constant.
(hasChar, encodeChar): Accept a jint character code rather than
a jchar.

* java/org/gnu/emacs/EmacsSdk23FontDriver.java (hasChar)
(encodeChar): Return 0 or FONT_INVALID_CODE if the character is
not representable in a Java char.

* java/org/gnu/emacs/EmacsSdk7FontDriver.java (hasChar): Ditto.

* src/androidfont.c (android_init_font_driver): Adjust signature
to match.

3 files changed, 29 insertions, 8 deletions

diff --git a/java/org/gnu/emacs/EmacsFontDriver.java b/java/org/gnu/emacs/EmacsFontDriver.java
index ff52899a897..798c3cfb032 100644
--- a/java/org/gnu/emacs/EmacsFontDriver.java
+++ b/java/org/gnu/emacs/EmacsFontDriver.java
@@ -63,6 +63,11 @@ public abstract class EmacsFontDriver
   public static final int MONO          = 100;
   public static final int CHARCELL      = 110;
 
+  /* Special glyph codes.  */
+  public static final int FONT_INVALID_CODE = 0xFFFFFFFF;
+
+
+
   public static class FontSpec
   {
     /* The fields below mean the same as they do in enum
@@ -148,15 +153,17 @@ public abstract class EmacsFontDriver
     }
   };
 
+
+
   /* These mean the same as they do in struct font_driver.  */
   public abstract FontEntity[] list (FontSpec fontSpec);
   public abstract FontEntity match (FontSpec fontSpec);
   public abstract String[] listFamilies ();
   public abstract FontObject openFont (FontEntity fontEntity, int pixelSize);
-  public abstract int hasChar (FontSpec font, char charCode);
+  public abstract int hasChar (FontSpec font, int charCode);
   public abstract void textExtents (FontObject font, int code[],
                                     FontMetrics fontMetrics);
-  public abstract int encodeChar (FontObject fontObject, char charCode);
+  public abstract int encodeChar (FontObject fontObject, int charCode);
   public abstract int draw (FontObject fontObject, EmacsGC gc,
                             EmacsDrawable drawable, int[] chars,
                             int x, int y, int backgroundWidth,
diff --git a/java/org/gnu/emacs/EmacsSdk23FontDriver.java b/java/org/gnu/emacs/EmacsSdk23FontDriver.java
index aaba8dbd166..0752d8064ac 100644
--- a/java/org/gnu/emacs/EmacsSdk23FontDriver.java
+++ b/java/org/gnu/emacs/EmacsSdk23FontDriver.java
@@ -96,7 +96,7 @@ public final class EmacsSdk23FontDriver extends EmacsSdk7FontDriver
 
   @Override
   public int
-  hasChar (FontSpec font, char charCode)
+  hasChar (FontSpec font, int charCode)
   {
     Sdk7FontObject fontObject;
     Paint paint;
@@ -109,6 +109,12 @@ public final class EmacsSdk23FontDriver extends EmacsSdk7FontDriver
     else
       paint = ((Sdk7FontEntity) font).typeface.typefacePaint;
 
-    return paint.hasGlyph (String.valueOf (charCode)) ? 1 : 0;
+    /* If the character falls within the confines of the BMP, return
+       1.  */
+    if (charCode < 65536)
+      return paint.hasGlyph (String.valueOf ((char) charCode)) ? 1 : 0;
+
+    /* Otherwise return 0.  */
+    return 0;
   }
 };
diff --git a/java/org/gnu/emacs/EmacsSdk7FontDriver.java b/java/org/gnu/emacs/EmacsSdk7FontDriver.java
index b8aecbe7c2d..21ae159d5bd 100644
--- a/java/org/gnu/emacs/EmacsSdk7FontDriver.java
+++ b/java/org/gnu/emacs/EmacsSdk7FontDriver.java
@@ -291,13 +291,18 @@ public class EmacsSdk7FontDriver extends EmacsFontDriver
 
   @Override
   public int
-  hasChar (FontSpec font, char charCode)
+  hasChar (FontSpec font, int charCode)
   {
     float missingGlyphWidth, width;
     Rect rect1, rect2;
     Paint paint;
     Sdk7FontObject fontObject;
 
+    /* Ignore characters outside the BMP.  */
+
+    if (charCode > 65535)
+      return 0;
+
     if (font instanceof Sdk7FontObject)
       {
         fontObject = (Sdk7FontObject) font;
@@ -308,7 +313,7 @@ public class EmacsSdk7FontDriver extends EmacsFontDriver
 
     paint.setTextSize (10);
 
-    if (Character.isWhitespace (charCode))
+    if (Character.isWhitespace ((char) charCode))
       return 1;
 
     missingGlyphWidth = paint.measureText (TOFU_STRING);
@@ -325,7 +330,7 @@ public class EmacsSdk7FontDriver extends EmacsFontDriver
 
     paint.getTextBounds (TOFU_STRING, 0, TOFU_STRING.length (),
                          rect1);
-    paint.getTextBounds ("" + charCode, 0, 1, rect2);
+    paint.getTextBounds ("" + (char) charCode, 0, 1, rect2);
     return rect1.equals (rect2) ? 0 : 1;
   }
 
@@ -410,8 +415,11 @@ public class EmacsSdk7FontDriver extends EmacsFontDriver
 
   @Override
   public int
-  encodeChar (FontObject fontObject, char charCode)
+  encodeChar (FontObject fontObject, int charCode)
   {
+    if (charCode > 65535)
+      return FONT_INVALID_CODE;
+
     return charCode;
   }